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Tek 2465B intensity problem

Discussion in 'Electronic Repair' started by joeboatertx, Apr 24, 2009.

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  1. joeboatertx

    joeboatertx Guest

    I have a problem with my 2465B. The display went blank so I got the
    service manual and started following the flow charts. The took me to
    a dead end but gave me a hint. Turning up the grid bias did bring the
    display into view and the scope seems to be working other than the
    intensity. The intensity adjustment makes no difference at all. I
    followed that adjustment in the schematics and the signal is called
    "DI" until it gets to U650. It seems to be a non-TTL level signal (to
    low). I can see something changing in the signal when I adjust the
    Intensity, but can make sense of it. It appears to have some kind of
    small digital component at a very low level. Or perhaps that is my
    problem. I could not find any info on this signal in the manual.

    Can anyone tell me what the DI signal is supposed to look like?
    Should adjusting the intensity affect the "Brightness" signal coming
    out of U650? I just don't get enough info in the manual on these
    signals or where DI goes after U650.

    Thanks!
     
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